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SiENBE12-713
Troubleshooting
Service Diagnosis
273
5.26 Low-voltage Detection or Over-voltage Detection
Remote Control
Display
U2
Outdoor Unit LED
Display
A
5
1
4
2
1
3
1
4
4
Method of
Malfunction
Detection
An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage
detection circuit.
Malfunction
Decision
Conditions
"
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or
the voltage being detected by the DC voltage detection circuit is judged to be below 150 V
for 0.1 second.
"
The system will be shut down if the error occurs 16 times.
"
Clearing condition: Continuous run for about 60 minutes (normal)
Supposed
Causes
"
Supply voltage not as specified
"
Over-voltage detector or DC voltage detection circuit defective
"
PAM control part(s) defective
Troubleshooting
Check the supply voltage.
Correct the power supply.
Check for such factors for a
long term.
∗
Try to get restarted a
couple of times.
Replace the PM1.
(Replace the outdoor unit
PCB.)
(R5151)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Supply voltage as
specified?
NO
YES
Turn on the
power again.
System restarted?
NO
Repeat a
couple of times.
YES
(Precaution before turning on the power again)
Make sure the power has been off for
at least 30 seconds.
Disturbance factors
∗
Noise
∗
Power supply distortion
Summary of Contents for FTKS20D3VMW
Page 11: ...Introduction SiENBE12 713 x...
Page 47: ...Specifications SiENBE12 713 36 Specifications...
Page 113: ...Control Specification SiENBE12 713 102 Function and Control...
Page 235: ...Instruction SiENBE12 713 224 System Configuration...
Page 297: ...Check SiENBE12 713 286 Service Diagnosis...
Page 316: ...SiENBE12 713 Outdoor Unit Removal Procedure 305 Step Procedure Points...